Unfortunately, item deletion is a redundant topic. However, I like this one. Especially the part about putting lava in cauldrons. Support, but be wary as this may be flagged as a redundant topic and closed.
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"Minecraftia, a world of peace yet danger, a world of light yet darkness, a world of good yet evil. Every good thing you see has it's evil counterpart, evenly matching the power of the two. I intend, however, to simplify things down to one part, which just happens to be evil."- The Infector
You can put lava in a caldron and if you attach a hopper to it any items the hopper picks up will be moved into the caldron and deleted?
Only requires 2 blocks of space and no new blocks added.
This system would not just be smaller, but safer then current systems.
You could also put a chest on top of the hopper so you can just shift click items into it and wait for them all to be deleted with very little effort.
Wait for time
In the break of new dawn
We will never meet
Support.